किस (m) के लिए \(x^2+mx+49\) पूर्ण वर्ग त्रिपद बनेगा?
For which (m) will \(x^2+mx+49\) be a perfect square trinomial?
Explanation opens after your attempt
B. (14)
Concept
\(49=7^2\), and a perfect square needs middle term \(2\cdot7x=14x\). Exam tip: take the square root of the last term.
Why this answer is correct
The correct answer is B. (14). \(49=7^2\), and a perfect square needs middle term \(2\cdot7x=14x\). Exam tip: take the square root of the last term.
Exam Tip
\(49=7^2\) और पूर्ण वर्ग के लिए मध्य पद \(2\cdot7x=14x\) चाहिए। परीक्षा में अंतिम पद का वर्गमूल लें।
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